| Author | Takata, Shingo| Ashida, Kozo| Hosaki, Yasuhiro| Hamada, Masanori| Iwagaki, Naofumi| Kikuchi, Hiroshi| Mitsunobu, Fumihiro| |
|---|---|
| Published Date | 2008-03-01 |
| Publication Title | 岡大三朝医療センター研究報告 |
| Volume | volume76 |
| Content Type | Departmental Bulletin Paper |
| Author | Takata, Shingo| Ashida, Kozo| Hosaki, Yasuhiro| Hamada, Masanori| Iwagaki, Naofumi| Kikuchi, Hiroshi| Mitsunobu, Fumihiro| |
|---|---|
| Published Date | 2008-03-01 |
| Publication Title | 岡大三朝医療センター研究報告 |
| Volume | volume76 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/19957 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_32.pdf |
| Author | Kanatani, Kenichi| Niitsuma Hirotaka| Sugaya Yasuyuki| |
| Abstract | We present an alternative approach to what we call the “standard optimization”, which minimizes a cost function by searching a parameter space. Instead, the input is “orthogonally projected” in the joint input space onto the manifold defined by the “consistency constraint”, which demands that any minimal subset of observations produce the same result. This approach avoids many difficulties encountered in the standard optimization. As typical examples, we apply it to line fitting and multiview triangulation. The latter produces a new algorithm far more efficient than existing methods. We also discuss optimality of our approach. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 32 |
| End Page | 41 |
| ISSN | 1349-6115 |
| language | 英語 |
| File Version | publisher |
| NAID | 120002309124 |
| JaLCDOI | 10.18926/19959 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_50.pdf |
| Author | Kanatani, Kenichi| Niitsuma Hirotaka| Rangrajan Prasanna| |
| Abstract | We present highly accurate least-squares (LS) alternatives to the theoretically optimal maximum likelihood (ML) estimator for homographies between two images. Unlike ML, our estimators are non-iterative and yield solutions even in the presence of large noise. By rigorous error analysis, we derive a “hyperaccurate” estimator which is unbiased up to second order noise terms. Then, we introduce a computational simplification, which we call “Taubin approximation”, without incurring a loss in accuracy. We experimentally demonstrate that our estimators have accuracy surpassing the traditional LS estimator and comparable to the ML estimator. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 50 |
| End Page | 59 |
| ISSN | 1349-6115 |
| language | 英語 |
| File Version | publisher |
| NAID | 120002308986 |
| JaLCDOI | 10.18926/44496 |
|---|---|
| FullText URL | mfe_045_015_026.pdf |
| Author | Kanatani, Kenichi| Rangrajan, Prasanna| Sugaya, Yasuyuki| Niitsuma, Hirotaka| |
| Abstract | We present a new least squares (LS) estimator, called “HyperLS”, specifically designed for parameter estimation in computer vision applications. It minimizes the algebraic distance under a special scale normalization, which is derived by rigorous error analysis in such a way that statistical bias is removed up to second order noise terms. Numerical experiments suggest that our HyperLS is far superior to the standard LS and comparable in accuracy to maximum likelihood (ML), which is known to produce highly accurate results in image applications but may fail to converge if poorly initialized. Our HyperLS is a perfect candidate for ML initialization. In addition, we discuss how image-based inference problems have different characteristics form conventional statistical applications, with a view to serving as a bridge between mathematicians and computer engineers. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 15 |
| End Page | 26 |
| ISSN | 1349-6115 |
| language | 英語 |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 120002905952 |
| JaLCDOI | 10.18926/44498 |
|---|---|
| FullText URL | mfe_045_036_045.pdf |
| Author | Kanatani, Kenichi| Niitsuma, Hirotaka| |
| Abstract | We present a new method for optimally computing the 3-D rotation from two sets of 3-D data. Unlike 2-D data, the noise in 3-D data is inherently inhomogeneous and anisotropic, reflecting the characteristics of the 3-D sensing used. To cope with this, Ohta and Kanatani introduced a technique called “renormalization”. Following them, we represent a 3-D rotation in terms of a quaternion and compute an exact maximum likelihood solution using the FNS of Chojnacki et al. As an example, we consider 3-D data obtained by stereo vision and optimally compute the 3-D rotation by analyzing the noise characteristics of stereo reconstruction. We show that the widely used method is not suitable for 3-D data. We confirm that the renormalization of Ohta and Kanatani indeed computes almost an optimal solution and that, although the difference is small, the proposed method can compute an even better solution. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 36 |
| End Page | 45 |
| ISSN | 1349-6115 |
| language | 英語 |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 80021759250 |
| JaLCDOI | 10.18926/48125 |
|---|---|
| FullText URL | mfe_046_001_009.pdf |
| Author | Kanatani, Kenichi| Niitsuma, Hirotaka| |
| Abstract | We optimally estimate the similarity (rotation, translation, and scale change) between two sets of 3-D data in the presence of inhomogeneous and anisotropic noise. Adopting the Lie algebra representation of the 3-D rotational change, we derive the Levenberg-Marquardt procedure for simultaneously optimizing the rotation, the translation, and the scale change. We test the performance of our method using simulated stereo data and real GPS geodetic sensing data. We conclude that the conventional method assuming homogeneous and isotropic noise is insufficient and that our simultaneous optimization scheme can produce an accurate solution. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2012-01 |
| Volume | volume46 |
| Start Page | 1 |
| End Page | 9 |
| ISSN | 1349-6115 |
| language | 英語 |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 80022451620 |
| JaLCDOI | 10.18926/48127 |
|---|---|
| FullText URL | mfe_046_021_033.pdf |
| Author | Kanatani, Kenichi| Niitsuma, Hirotaka| |
| Abstract | Because 3-D data are acquired using 3-D sensing such as stereo vision and laser range finders, they have inhomogeneous and anisotropic noise. This paper studies optimal computation of the similarity (rotation, translation, and scale change) of such 3-D data. We first point out that the Gauss-Newton and the Gauss-Helmert methods, regarded as different techniques, have similar structures. We then combine them to define what we call the modified Gauss-Helmert method and do stereo vision simulation to show that it is superior to either of the two in convergence performance. Finally, we show an application to real GPS geodetic data and point out that the widely used homogeneous and isotropic noise model is insufficient and that GPS geodetic data are prone to numerical problems. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2012-01 |
| Volume | volume46 |
| Start Page | 21 |
| End Page | 33 |
| ISSN | 1349-6115 |
| language | 英語 |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 80022451622 |
| JaLCDOI | 10.18926/OLR/54889 |
|---|---|
| Title Alternative | Several Points of Issue on the Informed Consent-An Analysis of a Model Case from the Aspect of Comparative Law |
| FullText URL | olr_018_015_046.pdf |
| Author | Yamashita| |
| Publication Title | Okayama Law Review |
| Published Date | 2017-03 |
| Volume | volume18 |
| Start Page | 15 |
| End Page | 46 |
| ISSN | 1881-1485 |
| language | 日本語 |
| File Version | publisher |
| NAID | 120006026943 |
| JaLCDOI | 10.18926/okadaironkou/59986 |
|---|---|
| Author | 西山 康一| 荒井 真理亜| |
| Publication Title | 岡大国文論稿 |
| Published Date | 2019-03-31 |
| Issue | issue47 |
| Start Page | 16 |
| End Page | 35 |
| ISSN | 0386-3123 |
| language | 日本語 |
| File Version | publisher |
| NAID | 40021947356 |
| JaLCDOI | 10.18926/okadaironkou/60022 |
|---|---|
| FullText URL | okadaironkou_43_18_32.pdf |
| Author | 羽原 卓也| 西山 康一| 山本 秀樹| |
| Publication Title | 岡大国文論稿 |
| Published Date | 2015-03-31 |
| Issue | issue43 |
| Start Page | 18 |
| End Page | 32 |
| ISSN | 0386-3123 |
| language | 日本語 |
| File Version | publisher |
| NAID | 40020533643 |
| JaLCDOI | 10.18926/okadaironkou/60030 |
|---|---|
| FullText URL | okadaironkou_42_39_54.pdf |
| Author | 羽原 卓也| 西山 康一| 山本 秀樹| |
| Publication Title | 岡大国文論稿 |
| Published Date | 2014-03-31 |
| Issue | issue42 |
| Start Page | 39 |
| End Page | 54 |
| ISSN | 0386-3123 |
| language | 日本語 |
| File Version | publisher |
| NAID | 40020144376 |
| JaLCDOI | 10.18926/okadaironkou/60035 |
|---|---|
| FullText URL | okadaironkou_41_15_29.pdf |
| Author | 西山 康一| 庄司 達也| |
| Publication Title | 岡大国文論稿 |
| Published Date | 2013-03-31 |
| Issue | issue41 |
| Start Page | 15 |
| End Page | 29 |
| ISSN | 0386-3123 |
| language | 日本語 |
| File Version | publisher |
| NAID | 40019753070 |
| Author | Ando, Mikayo| |
|---|---|
| Published Date | 2008-10-25 |
| Publication Title | 岡山大学教育学部研究集録 |
| Volume | volume139 |
| Issue | issue1 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/14406 |
|---|---|
| Title Alternative | Psychoeducational approach to prevent emotional and behavioral problems among forth graders in an elementary school |
| FullText URL | 008_089_098.pdf |
| Author | Ando, Mikayo| |
| Abstract | 青少年の情緒的および行動上の問題を予防するための心理教育的アプローチとして、心の健康教室プログラム“サクセスフル・セルフ”を開発し、小学校高学年の児童、中学生を中心に実施している。本研究では、このプログラムを小学4年生に実施し、その評価を行った。プログラム前から後の心理社会的要因、情緒的および行動上の問題に関する要因の変化を検討したところ、男女とも「衝動性・攻撃性」、「いじめ」、「身体的いじめ加害」、「言語的いじめ加害」、「仲間はずれ加害」、「身体的いじめ被害」、「無視被害」、「仲間はずれ被害」、「夜遊び」、「落ち込み」、「泣く・泣きたい」、「不眠」において、有意な減少が見られた。プログラム後の児童の感想から、自己理解、他者理解、自分の気持ちを話して気分が楽になる体験の場になったことが示唆された。引き続きの検討が必要と考えられるが、本プログラムの祥がう4年生への学級での実施は可能で、主にいじめや抑うつ状態に建設的な変化をもたらすことが推測された。 |
| Abstract Alternative | A psychoeducational program entitled, "Successful Self", has been developed and administered to students from the fifth grade through junior high school grades to prevent emotional and behavioral problems. The objective of this study was to evaluate this program when administered to fourth grade elementary students. Emotional and behavioral problems including "aggressiveness and impulsiveness", "physical and verbal bullying", "staying out late at night", "depression", "sleeplessness", "exclusion", and "crying" significantly decreased from pre to post interventions. The students' impressions indicated that the program helped them better understand themselves as well as others in communicating their problematical feelings. It is suggested that this psychoeducational program be administered to fourth grade students in an effort to lessen bullying and depression. |
| Keywords | 問題行動 (Problem behavior) いじめ (depression) 抑うつ状態 (bullying) 小学生 (primary school students) 心理教育 (psychoeducation) |
| Publication Title | 岡山大学教育実践総合センター紀要 |
| Published Date | 2008-03-10 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 89 |
| End Page | 98 |
| ISSN | 1346-3705 |
| language | 日本語 |
| File Version | publisher |
| NAID | 120002308421 |
| Author | Ando, Mikayo| |
|---|---|
| Published Date | 2009-10-21 |
| Publication Title | 岡山大学大学院教育学研究科研究集録 |
| Volume | volume142 |
| Content Type | Departmental Bulletin Paper |
| Author | Ando, Mikayo| Asakura, Takashi| Gabriele Giorgi| |
|---|---|
| Published Date | 2009-06-25 |
| Publication Title | 岡山大学大学院教育学研究科研究集録 |
| Volume | volume141 |
| Content Type | Departmental Bulletin Paper |
| Author | Ando, Mikayo| |
|---|---|
| Published Date | 2010-02-25 |
| Publication Title | 岡山大学大学院教育学研究科研究集録 |
| Volume | volume143 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/19997 |
|---|---|
| Title Alternative | Psychosocial factors associated with eating behavior among junior high school students: A focus group interview approach |
| FullText URL | 010_001_010.pdf |
| Author | Tomioka, Yoshiko| Ando, Mikayo| |
| Abstract | 本研究の目的は、中学生を対象に肥満度別にフォーカスグループインタビュー調査を行い、肥満と痩身に関わる摂食行動の心理社会的要因を検討することである．｢日常の摂食行動に影響を与えている要因｣｢摂食行動の変化に影響を与えている要因｣｢食に対する意識｣｢家族からの影響｣について、発言内容のカテゴリー分析を行った結果、摂食行動は「家族や他者との関係」｢食や健康に対する認知｣｢体型に対する認知と満足感｣｢ストレス｣と関連することが示唆された．また、痩身群に情緒と関連づける傾向が見られたこと、標準群と肥満群に体型への関心が見られたこと、痩身群と肥満群に体型に対して周囲からの体型是正に向けた働きかけが見られたことは、肥満度による特徴と考えられた．健康的な摂食行動を行う能力を育てる上でこれらを踏まえた食教育や心理教育的アプローチを行う必要性があると考えられた． |
| Abstract Alternative | The objective of this study was to identify psychosocial factors involved in eating behaviors associated with obesity and thinness through focus group interviews among junior high school students in three separate categories: obesity, thinness, and normal weight. Students were interviewed and questioned about factors influencing their daily eating habits; factors influencing changes of eating behavior; factors influencing eating behavior due to family thinking and attitudes. The contents of the interviews were analyzed in all three categories, and the results showed that eating behaviors among junior high school students were associated with personal and family relationships, stress, cognition of eating and health, and cognition and satisfaction on the body. Furthermore, the students in the thinness category displayed tendencies in eating behavior to be associated with emotional factors. The normal weight category of students and the obesity category were more interested in their bodies. The obesity group and the thinness group were approached to change their bodies by others. From these interviews in the three weight categories, it was suggested that basic eating information and psychoeducational approaches to improve healthy eating behavior were needed. |
| Keywords | 中学生 (junior high school students) 摂食行動 (eating behavior) 心理社会的要因 (psychosocial factors) フォーカスグループインタビュー (focus group interview) |
| Publication Title | 岡山大学教育実践総合センター紀要 |
| Published Date | 2010-03-10 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 10 |
| ISSN | 1346-3705 |
| language | 日本語 |
| Copyright Holders | 岡山大学教育学部附属教育実践総合センター |
| File Version | publisher |
| NAID | 120002309137 |
| JaLCDOI | 10.18926/19998 |
|---|---|
| Title Alternative | Psychosocial stress in school life and its psychoeducational approach among elementary school students |
| FullText URL | 010_011_020.pdf |
| Author | Okazaki, Yumiko| Ando, Mikayo| |
| Abstract | 小学生の学校生活におけるストレスの実態を明らかにするために,小学校5,6年生2,486名を対象に,調査を行った。その結果,友達関係が,ストレッサーにも,ストレスコーピングにもなっていた。そこで,友達関係に着目し,ストレスを軽減することをねらいとした心理教育的プログラムを作成しその効果について評価を行った。対象は,小学5年生2学級58人である。プログラムを行った群(介入群),同じ時期にプログラムを行わなかった群(統制群)の2群に分け,介入群がプログラムを行った前後に,両群ともストレスに関する調査を実施した。その結果,介入群でも統制群でも,プログラム前から後で「情緒不安定」「集中力低下」「抑うつ」「身体症状」の有意な減少がみられた。プログラム後の児童の感想から，自己理解，他者理解，学習したことの生活での応用への意欲，友達関係向上への期待が持てる場になったことが示唆された。 |
| Abstract Alternative | The objective of this study was to clarify the prevalence of stress which is related to school life among elementary school students. Two thousand, four hundred and eighty-six (N=2,486) elementary school students between 5th and 6th grades completed a self-reported questionnaire. Factors of stressor, physical and psychological stress responses and stress coping were investigated. The results showed that the students experienced interpersonal relationships with friends as not only stressor but also stress coping. Based on these results, a school-based psychoeducational program to prevent stress in school life among elementary school students was developed. The second objective of this study was to evaluate the impact of the program. Fifty-eight (N=58) 5th graders were enrolled in the program and completed Time 1 and Time 2 surveys. The program was implemented in one class between Time 1 and Time 2 surveys (Intervention group), but it was not implemented in the other class between Time 1 and Time 2 surveys (Control group). Both groups reported significant improvement in stress responses concerning emotional status, concentration, depressive status, and physical status. The students responded positively toward understanding themselves and others, being motivated to better handle stress in their own lives, and establishing adequate relationships with friends. |
| Keywords | 小学生 (elementary school students) 学校生活 (school life) 心理社会的ストレス (psychosocial stress) 心理教育的アプローチ (psychoeducational approach) |
| Publication Title | 岡山大学教育実践総合センター紀要 |
| Published Date | 2010-03-10 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 11 |
| End Page | 20 |
| ISSN | 1346-3705 |
| language | 日本語 |
| Copyright Holders | 岡山大学教育学部附属教育実践総合センター |
| File Version | publisher |
| NAID | 120002309134 |
